Analysis of Reliability of the Harary Graph

When the vertices fail independently with each other by a constant probability,the reliability of a sraph is defined to be the probability that the graph results from deleting thefailed venices together with the incidence edges is connected. The Harary graph,a class of graphswith the best connectivity is considered in this paper,the bound of it's reliability is obtained,and theasymptotic property of reliability is also analysed.     

AN EXPERIMENTAL STUDY OF THE ASEISMATIC BEHAVIOUR OF WIDE-SHALLOW COUPLING BEAMS

This paper presents the experimental results of 9 specimens.The mainobject of this experiment is to study the aseismatic behaiour of wide-shallowcoupling beams.Several variables that exert main influence on the behaviourare considered.Also,some aspects concerning the specific design are proposed.     

麦蚜取食行为特殊刺探电位波形图(EPG)研究初报

研究了麦长管蚜(Sitobionavenae.Fab.)、禾谷缢管蚜(RhopalosiphumPadi)在不同小麦上的刺探行为,发现了一些特殊的刺探电位波形(EPG),即点G波,E0波和两种F波,并就其可能的生物学意义进行了探讨。初步认为,点G波是蚜虫在刺探途径阶段(C波阶段)的试探性主动吸食过程;E0波是蚜虫口针即将到达韧皮部时短暂的判断、休息和适应过程;一种F波是蚜虫在木质部主动吸食受阻的一种过渡波;另一种F波与蚜虫口针在植物组织中遇阻后的重复回撤与刺探行为有关。结果表明,EPG波形不仅有其稳定性,同时也有其多样性。     

乳中环核苷酸提取方法研究

根据环核苷酸理化性质及乳的特点，采用酶法从乳汁中提取环核苷酸。研究表明，该方法条件温和、工艺合理、操作方便。经放射免疫测定提取浓缩液浓度为ｃＡＭＰ２０μｍｏｌ·Ｌ－１，ｃＧＭＰ０．２μｍｏｌ·Ｌ－１．     

两个新的正整数分拆恒等式

正整数的分拆与许多计数问题有着密切的关系,并且关于正整数的分拆产生了许多重要的恒等式,但很多正整数的分拆恒等式常以有序分拆或无序分拆单方面讨论。将正整数的有序分拆和无序分拆联系起来,给出了两个新的与正整数的有序分拆和无序分拆相关的恒等式,并利用组合方法给出了证明。     

在Autocad平台建立具有GIS特征的森林图形系统

该文从森林图形库的概念和基本特征出发 ,完成森林图形库图层的标准设计和森林图形中小班多边形的封闭 .通过对森林图形的图元访问 ,实现森林图形”归一化” .在”归一化”森林图形上 ,实现其与资源数据库互访的动态管理     

满足某些性质的树因子

设Ｇ是一个图ｆ是定义在Ｖ（Ｇ）上的非负整数函数，Ｇ的一个支撑子图Ｆ称为Ｇ的一个ｆ因子，若对任意的ｖ∈Ｖ（Ｇ），有ｄＦ（ｖ）＝ｆ（ｖ）．若Ｔ是一个连通无圈图，则称Ｔ是一棵树。在本文中，我们对满足某些性质的树因子进行了研究，分别给出了一棵树存在ｆ－因子过指定的一条边或不过指定一条边的充要条件。     

Network thinking in riverscape conservation – A graph-based approach

Graph theoretic approaches have received increased interest recently in landscape planning and conservation in the terrestrial realm, because these approaches facilitate the effective modelling of connectivity among habitats. We examined whether basic principles of graph theory can be extended to other ecosystems. Specifically, we demonstrate how a network-based context can be used for enhancing the more effective conservation of riverine systems. We first show how to use graph theoretic techniques to model riverscapes at the segment level. Then we use a real stream network (Zagyva river basin, Hungary) to examine the topological importance of segments in maintaining riverscape connectivity, using betweenness centrality, a commonly used network measure. Using the undirected graph model of this riverscape, we then prioritize segments for conservation purpose. We examine the value of each of the 93 segments present in the Zagyva river basin by considering the conservation value of local fish assemblages, connectivity and the size of the habitat patches. For this purpose we use the ‘integral index of connectivity’, a recently advocated habitat availability index. Based on the results the selection of the most valuable habitat segments can be optimized depending on conservation resources. Because of their inherent advantage in the consideration of connectivity relationships, we suggest that network analyses offer a simple, yet effective tool for searching for key segments (or junctions) in riverscapes for conservation and environmental management. Further, although the joint consideration of aquatic and terrestrial networks is challenging, the extension of network analyses to freshwater systems may facilitate the more effective selection of priority areas for conservation in continental areas.     

采收期对阿克苏地区灰枣cAMP含量的影响研究

[目的]研究测定灰枣cAMP含量的新方法及灰枣采收期对其cAMP含量的影响.[方法]以阿克苏地区灰枣为研究对象,建立了HPLC法测定灰枣中cAMP含量的定量测定方法,并对不同采收时期的灰枣及其制干产品的cAMP含量进行了测定.[结果]试验表明,HPLC测定cAMP含量的色谱条件为:选用Inertsil ODS-3色谱柱(4.6 ×250 ×5 μm)、以10％甲醇-90％的浓度为0.167 8％甲酸溶液为流动相、柱温30℃、流速0.8 ml/min、检测波长254nm测定灰枣中的cAMP含量,cAMP浓度在1.0～100.0 μg/ml范围内与峰面积具有良好的线性关系,R2=0.9990,且其精密性高、重现性好、加标回收率高(＞98％,RSD值为1.38％).灰枣采收时期对鲜枣及其制干产品的cAMP含量有显著影响(达到0.01显著水平).[结论]阿克苏地区灰枣在10月24日至10月31日期间采收,有利于保持较高的cAMP含量,此期采收的鲜灰枣及其干枣的cAMP含量分别为75.237和294.097μg/g左右.研究可为新疆阿克苏地区红枣产业化发展提供科学参考.